Dreams are image activities caused by various stimuli inside and outside the body or external stimuli left in the brain during the day during sleep, so they are closely related to daily life experiences and mental activities. The main reasons for always dreaming in bed are as follows: physiological factors: too full or too hungry before bedtime, daily smoking or drinking a lot of alcohol, drinking coffee, tea or functional beverages, or strenuous exercise before bedtime leading to mental exhilaration, excessive sleep time during the day, etc. These patients are the most minor and can generally recover with a little adjustment. Environmental factors: Poor sleep environment or change of sleep environment may lead to poor sleep, sleep process stimulated by various environmental factors outside the body, such as light, temperature, sound, etc., will affect the quality of sleep. Psychological factors: It is often said that “there are thoughts in the day and dreams in the night”, too much psychological burden can also lead to excessive dreaming, such as a tense state of mind before going to bed, worry about the symptoms of excessive dreaming. If you are always thinking about something during the day, it will also recur in your sleep. Physical factors: Some diseases can be reflected in dreams, for example, neurological diseases will often dream of being hit on the head, auditory center lesions will appear strange sounds in dreams, respiratory system diseases often dream of poor breathing, etc.; some discomfort in human waking hours will be brought to dreams, and long-term use of certain drugs will also lead to excessive dreaming. In conclusion, dream is a phenomenon influenced by many factors, and the main reasons include environment, psychology, physiology and somatic aspects. Dreams are normal physiological phenomena of human beings, even if they dream every day, as long as they do not affect the daytime life are normal.